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Contactless Hall-effect angular position sensor

a sensor and hall-effect technology, applied in the field of angular position sensors, can solve the problems of limited sensor size, limited sensor size, and inability to reduce the size of hall-effect cells

Inactive Publication Date: 2008-07-15
CONTINENTAL AUTOMOTIVE SYST INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This configuration enables smaller outer diameters and maintains desired accuracy in measuring angular position without the limitations imposed by the Hall-effect cell size, allowing for application-specific sizing of the sensor.

Problems solved by technology

Disadvantageously, the size of the sensor is limited by the size of the Hall Effect cell.
However, the Hall-effect cell cannot be reduced in size proportionate to the reduction in the gap.
For this reason, the size of the sensor is limited by the size of the Hall-effect cell, as decreasing air gaps prevent installation of the Hall-effect cell between the flux guide and the ring.

Method used

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  • Contactless Hall-effect angular position sensor
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  • Contactless Hall-effect angular position sensor

Examples

Experimental program
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Embodiment Construction

[0015]Referring to FIG. 1, an example angular position sensor assembly 10 includes a ferrous ring 12 supported within a non-magnetic housing 42. The housing 42 also supports a magnet 16 and a Hall-effect sensor 18. A sector member 14 is supported for movement relative to the housing 42 and thereby the ring 12 within a drive arm 40. The drive arm 40 is fabricated from non-magnetic material and is supported between the housing 42 and a base 56. The base 56 includes seals 50 and 52 for preventing moisture or other contaminants into the internal workings of the sensor assembly.

[0016]The drive arm 40 is rotated by an external device (not shown) to detect and provide desired position information indicative of such movement. Rotation of the drive arm 40 causes rotation of the sector member 14 relative to the ring 12 and the magnet 16. The movement of the sector member 14 generates changes in a magnetic field that is sensed by the Hall-Effect sensor 18. The Hall-effect sensor 18 generates e...

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Abstract

An example angular position sensor assembly includes a sector member that rotates within a ring including a permanent magnet disposed centrally within the ring and a Hall-effect sensor adjacent the permanent magnet on an opposite side of the permanent magnet from the sector member.

Description

CROSS REFERENCE TO RELATED APPLICATION[0001]The application claims priority to U.S. Provisional Application No. 60 / 704,744 which was filed on Aug. 2, 2005.BACKGROUND OF THE INVENTION[0002]This invention generally relates to an angular position sensor. More particularly, this invention relates to an angular position sensor including a Hall-Effect sensor measuring changes in a magnetic field caused by a change in angular position.[0003]An angular position sensor includes a magnetic source generating a magnetic field disposed within a ferrous ring. A flux guide rotates within the ring between the ring and the magnetic source. A Hall-effect cell is disposed between the flux guide and the ring to sense changes in the magnetic field caused by rotation of the flux guide relative to the ring and the magnetic source. The Hall Effect cell is disposed within a magnetic flux path between the flux guide and the ring to provide optimal exposure to the magnetic field that in turn provides the desi...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): G01B7/30G01R33/07H01L43/06H10N52/00
CPCG01D5/147
Inventor SPELLMAN, CHARLESBABIN, BRIAN G.NARNEY, II, JOHN K.
Owner CONTINENTAL AUTOMOTIVE SYST INC